All ports
Port648/UDP
rrpPort
648
Protocol
UDP
Category
Well-Known
Service
rrp
What is port 648?
Port 648/UDP is a Well-Known port, assigned by IANA for widely recognized services. It is associated with the rrp service.
Registry Registrar Protocol (RRP)
Useful commands
nmapnmap -p 648 -sV example.comnetcatnc -zv example.com 648curlcurl -v http://example.com:648/telnettelnet example.com 648bash(echo > /dev/udp/example.com/648) 2>/dev/nullFirewall commands
UFWAllow
sudo ufw allow 648/udpDeny
sudo ufw deny 648/udpiptablesAllow
sudo iptables -A INPUT -p udp --dport 648 -j ACCEPTDeny
sudo iptables -D INPUT -p udp --dport 648 -j ACCEPTfirewalldAllow
sudo firewall-cmd --permanent --add-port=648/udpWindowsAllow
netsh advfirewall firewall add rule name="Open Port 648" dir=in action=allow protocol=UDP localport=648Security Risks
- Unauthorized access to the service
- Data exposure if the service is unauthenticated
- Outdated versions with vulnerabilities
- Incorrect service configuration
Frequently Asked Questions
What service runs on port 648/UDP?
Port 648/UDP is associated with the rrp service. Registry Registrar Protocol (RRP)
Is it safe to expose port 648 to the Internet?
It depends on the service and configuration. Port 648 (rrp) is a Well-Known port. If you need to expose it, keep the service updated, use strong authentication, and configure a firewall. It's always recommended to restrict access by IP when possible.
How do I check if port 648 is open?
You can use nmap: `nmap -p 648 -sV example.com`, netcat: `nc -zv example.com 648`, or the bash command: `(echo > /dev/udp/example.com/648) 2>/dev/null && echo "Open" || echo "Closed"`.
How do I open or close port 648 on my firewall?
On Linux with UFW: `sudo ufw allow 648/udp` (open) or `sudo ufw deny 648/udp` (close). With iptables: `sudo iptables -A INPUT -p udp --dport 648 -j ACCEPT`. On Windows: `netsh advfirewall firewall add rule name="Open Port 648" dir=in action=allow protocol=UDP localport=648`.
What applications and services use port 648?
Port 648/UDP is used by the rrp service. Specific uses depend on the software and configuration. Check our related tools section for more information.